A new approach for rhenium(VII) recovery by using modified brown algae Laminaria japonica adsorbent

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• 作者：Ying Xiong ; ^{xiongying_1977@hotmail.com} ; Jia Xu ; Weijun Shan ; ^{shanwj@lnu.edu} ; Zhenning Lou ; Dawei Fang ; Shuliang Zang ; Guangxi Han
• 关键词：Rhenium ; Brown algae ; Biosorption ; Kinetics ; Isotherm
• 刊名：Bioresource Technology
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：127
• 期：Complete
• 页码：464-472
• 全文大小：861 K

文摘

Brown algae Laminaria japonica was chemically modified with sulfuric acid to obtain a crosslinked brown algae gel (CAS). The CAS gel showed a high affinity for Re(VII) comparing with other biomass gels, and the maximum adsorption capacity was evaluated as 37.20 mg g^?1 in case of pH 6, which could be explained by their different adsorption mechanisms. The adsorption equilibrium, kinetics and thermodynamic study for Re(VII) on the CAS gel was discussed in detail by the several models, such as Langmuir, Freundlich, Temkin and Dubinin-Radushkevich model for kinetics analysis, the pseudo first, the second-order, the Elovich and intraparticle diffusion equation for equilibrium analysis. Reutilization of the CAS gel was confirmed up to three adsorption-elution cycles in column-mode operation with no damage of gel, packed in the column. The result also provides a new approach for the recovery of Re(VII) from Re-containing wastewater by using the modified brown algae gel.